235/50R19 vs 245/40R21
245/40R21 is 11.0 mm taller than 235/50R19 in overall diameter (+1.5%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 245/40R21 fitted, the speedometer reads 100 km/h when you are doing 101.5 km/h.
Dimensions side by side
| 235/50R19 | 245/40R21 | |
|---|---|---|
| Overall diameter | 718 mm (28.3″) | 729 mm (28.7″) |
| Section width | 235 mm | 245 mm |
| Sidewall height | 118 mm | 98 mm |
| Rim | 19″ | 21″ |
| Revolutions per km | 443 | 437 |
| In stock | 56 tires from $130.00 | 10 tires from $398.00 |
What changes
- Overall diameter: 245/40R21 is 11.0 mm taller (+1.5%).
- Speedometer: reads 100 km/h at an actual 101.5 km/h with 245/40R21.
- 245/40R21 is 10 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 19″ to 21″: you need wheels in the new size.
- Choose a load index at least as high as the one on your door placard.
Vehicles that came with both sizes
Vehicles that use 235/50R19
Vehicles that use 245/40R21
See every alternate size for 235/50R19
Frequently asked questions
Can I use 245/40R21 instead of 235/50R19?
Usually, yes: 245/40R21 is within 3% of the overall diameter of 235/50R19 (+1.5%). Use wheels of the right size and width, match or exceed the original load index, and check clearance at full steering lock.
How much does the speedometer change between 235/50R19 and 245/40R21?
With 245/40R21 instead of 235/50R19, the speedometer shows 100 km/h when you are actually doing 101.5 km/h.
Which vehicles came with both 235/50R19 and 245/40R21?
Both sizes were original equipment, on different trims or packages, on the 2019–2022, 2024 Volvo XC40, 2018–2024 Volvo V90 Cross Country.